condition mean min max ZT0-3 204.5564962 138.6308757 270.4821167 ZT4-7 310.95197900000005 288.94899150000003 332.9549665 ZT8-11 167.26735455 148.42331325 186.11139585 ZT12-15 187.83517035 133.02634270000001 242.643998 ZT16-19 412.1974864 348.35679565000004 476.03817715 ZT20-23 628.810242575 625.70355315 631.916932